Breaking changes have been made to the Sun Synk Connect server.
Sun Synk have released a new App that uses the same server, as a consequence (since Thursday 13th November) the client application now needs to authorise before user credential can be submitted for login authorisation.
Note: If your sunsynk account Thing is already logged in I believe it will continue to operate until its session expires (e.g. the sunsynk account Thing is modified or re-enabled or Sun Synk server goes offline) If its not broken don’t touch it until the pull request has completed.
I have add a new openHAB.jar for testing.